Improved saw-gummer



' d UNITED? f STATES' lPATnivT-` Orricn.

`A. IC. FOSTER, on HALLn'rrsviLLnTEXAS.

iMPnovo SAW-cumin En.

'Spceiiirntion forming part nl" .letters Patent No. 448,546, dated July4, 1865.. 1

a full, clear, and exact description of the samen! reference being hadtothe accompanying draw- 1. whichi ings, making'a part ,of thisspecification,..in4

. y Figure lis a side sectional viewof mydnventio taken-in the lineaw,Fig. 2; Fig. 2,-al plan \ot\r. top View of the same; Fig.' 3, a verticalsecf ion of a portion of thesanie, taken in the line' inilletfers ofnreference indicatecorre- Uspouding. parts in theseveraligures.-

vl-lhi'siinvention' relates tol'a new and improvedV i sawgumminginachineot that class in which l a grindstone is employed for performing Athework.` y 4 Theinvention'consistsin using,.in connection vithagrindstone, an. adjustable and a-.sliding barand levers, one of 4whichis provided with a. jaw or clamp, and all the parts so arranged as to,admit` of the work beingperformed in an ex ,peditiousand' perfectmanner. A r

Y To, enable those skilled 'n the art to fully understand and constructniy inventioin' lwill proceed to describe it. l .A represents the frameof the machine, which may befconstructed in any proper manner to supportthe workingparts. ,i

Bdea mandrelor arbor placed on the upper .i part df the frame A, andhaving upon it a driving-pulley,v C, and a' grindstone, Db`oth of whichare shown in Fig. 2.; 4The face ofthe' grindstone is' made4ofbeveledform, -as shown at "a,\andronnded at its `outer edge, asshownat brand-'a cap',E;is-placed over its 'top to preventv the'wat'er usedin the operation being '.thrownfb'ythe4 grindstone upon the attendent.'v F'represents a bar, which is placed upon-.the rtop ofthefra-meA,and hasa longitudinal refss y made initsnnder side,so as to form ashoulder, c',

near' eachend of it, between which shoulders andthe usides"of,tl1eira1ne Awedgesdare inteposed to' secure the bar FV in the desired ,gpo-Ay'sitiori-. This bar Fuhas `a slot, e,`made init,

' lwhich extends nearly its whole length,;and' to said .bar there vissecured, by a set-screw, j,

stop, G. (Shown in Figi) r H is aV bar, wh'ch valso has a slot, g, madein, it, extending nearly its whole length. .Dhisbar,` E isplacedupont-he bar F, and the formeris' provided with a pendent pin, h, at oneend,

`Qn the 4bar H there is secured by set-screwsz. anotcnedblock, Land J isa lever,which passes` through theblock I and has its fulcrum'pin j.

shown ir. FigfZ. s y i K'is a lever, thefulcrum-pin k ofwhich passes.dvthrough the bar H at the endopposite tothat passing into the upper partof the framing, as

where the pin h is attached. This'i'ulcrum-pin 7c passes through' theslotg of har H, and also Vtheough the slot c of bar F. The leverK has'an oblongslot, l, made-longitudinally in it, to admit 4of a curvedlever, L, passing'through git, said lever-werkingen a fulcrum-pin,m,which passes horizontally throughany of aseries-of holes, min lever K.(SeeFig. 3.) This leverV .L performs the office of ajawor clamp, ashereinafte'r explained.

Mis a-circular saw, which is fitted on the fuli erum-pin k) underneaththe bar H, said saw restingon the bar-Fthe inner endof tlhe'jaw or clampLvbeing underneath the, saw

The operation is as follows: .Thebar F is adjusted to'suit the size ofthe saw M and thean-f gie of the teeth required: Suppose, for instance,a saw be forty-eight inches in diameter, and it l is desired to have itsteeth'ran'ge twelve inches from the center,V the har .F.'is so adjustedthat its slot e will be twelveinches `from the front sdeof .the'grindstone l The'se'veral parts are, then adj usted together, or placedas previously described, the teethof the saw pointingtoward thegrinds'tone. The operator o r-` attendant standsfacingthe grndstonewithnis Einhand' restingl upon lever .J 'and his left, hipgently j v pressingsaid lever towardthe grind stone,while his 'right hand grasps the leverK and the jaw 'for clamp L, and through the medium of Vwhich the` saw Mis rotated, and by relieving the jaw@ or clamp L ofpressure the leverKean4 be moved l forwarder backward-without moving or rotat-` "ing thesaw. The grindstone is rotated with` high velocity,and the saw isbrought up t0 which prjectsdown through the slot e of har F.

it by actuating the lever J ,ya stream of vwater M being prevented f|'omrotating by clamping.`

being allowed to pass upon the grindstone at itrmly with lever-K and theolampo'rjaw its point of contact with thesaw. L, and the lever J is thenpressed toward lthe 'It is yimport-ant that the grindstone be not.grindsto'ne until-thesliding barHeomesin conallowed to act with bothsides at once upon the'. tact with the stop G, which may be adjustedsaw, as that wouldvcause the grindstone to run from time tortirne tocompensate for the wear heavily and subject'it to great Wear and ma.-.ofthe stone. `f t i V terially retardits work. The grindstonecoiu- Theadvantages of this invention consist-in -menees itsdvork at'the point otthe tooth at the itscheapne'ss and simplicity, capable of being `stonethrough the medium of lever J. lWhen back ofthe saine, 'and by ineens otthe levers .used without the liability ofinjuring the saw. J and K thesaw is presented to the grindstone the latter being under theeomplete'reontrol of anda kerf is made in ther saw threes-si'xf theoperator. l y ttenthsvor,y one-fourth of an inch, said kerf'exfHavingthus described my invention, what tending to the bottomvot vthetooth. This op I claim `as new, and desire to secure by Leteration isrepeated until the back of the tooth ters Patent, is-

is ot' the`desired shape. The stop Gr'on the l The grindstonel), withthe adjustable'bar F, bar '11 'determines the depth ofthe out of'the lsliding' bar H, and vwith the levers .IK and grindstone, and the saw hasthe proper feed clanlip orjaw infor theirA equivalents, allarniovementgiven it b v rotating it through the ranged,inconnectionwith'thesawM,tooperate medium' of the lever K and the clamporjaw substantially in the manner as andfoxthe purL/ L, while pressingit forward toward the vgxindpose herein set forth'.

A. K.' FOSTER.

thevback -ot' the tooth is finished the front of I W itnes'ses: thesucceeding tooth is brought in exaotrange M. W. WHEELER, with the frontside^ of the grindstone, the saw D. S. CARNDHAN.`

